A device which controls the voltage and current being delivered to a capacitor or battery.

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2answers
41 views

Solar Panel + Controller + Diode to float LiPos

I have a few solar panels I wanted to play around with and charge some 18650s till I get a little more comfortable that I won’t blow something up. My main goal is to understand how to charge ...
0
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1answer
34 views

How battery-charger system in mobile phones and laptops works?

It was 5 am in the morning stuck at McD and waiting for the train with my friends. All out of nowhere I asked them this question that I have been thinking about for some time. How this ...
0
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1answer
36 views

ReusingLithium Polymer battery from an Old Tablet

One of the projects that I am currently working on requires a backup battery source. I have 2 tablets with me that's that's dead (cracked screen) and the Asus one had a 4270mAh battery. I was trying ...
0
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1answer
61 views

Detect sudden change in current and send signal to arduino

I am trying to make a smart power socket using Arduino. The socket should power even high power equipments at 230 Volt 50hz through a relay. I want my arduino to analyse the amount of current taken ...
3
votes
2answers
538 views

Will the lower frequency of 50Hz AC affect overall charging time? [closed]

I'm using a voltage converter to go from 220V to 110V to charge a small appliance. The recommended charging time is 6-8 hours. However, this is specified for US AC voltage 110V@60Hz, whereas the ...
2
votes
3answers
105 views

Phone travel charger for powering circuits dangers

I am thinking of using a phone travel charger to power a circuit.Ratings: input:110-240VAC(my outlet has 220volts) 50/60Hz 0,3A output:DC 5,2volts at 400mA The problem is that 220 V are of course ...
0
votes
1answer
38 views

Backup battery charger

I'm trying to design some kind of backup battery charger - please see the image: Normally, the DC supply is ON, and provides current for load and also charges the battery. Battery should be charged ...
1
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1answer
38 views

LiPO reverse polarity protection with P-Fet & charger

I am trying to use a P-FET to protect my circuit against reverse polarity like such: Now i would like to add a LiPo charger to this circuit. Can i just add it after the P-FET (@+Vbatprotected)? ...
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0answers
51 views

How to make a robot charger?

I would like to equip my robot with a docking base to charge its batteries. My problem is that I do not want to turn off the Arduino in the robot during charge. I don't think we can use and charge a ...
0
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1answer
64 views

LM386 noise when using 5v power supply

I'm using LM386 with my guitar and currently I power it with 9v battery but now I want to switch to 5v power supply because I don't want to use a battery. I want to use a 5v usb wall charger + ...
0
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1answer
50 views

Schmitt trigger design to control lead acid battery charger

I've found a very good explanation on schmitt trigger circuit design here -What is a Schmitt Trigger and its application exactly? But the design is done considering same reference voltage and the ...
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0answers
44 views

Handmade usb charger

I am a mechanical engineer and I don't have so many knowledge on electronics. I tried to make a solar charger . I had a 12v12ah battery,a solar panel 20w, a battery charger and a dc-dc converter ...
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2answers
82 views

Li-Ion battery charging as simple as possible

I have read articles here and there about charging Li-Ion batteries. Most of them try to solve the problem of maximizing capacity and also maximizing cycles. The most recommended method is charging ...
0
votes
1answer
69 views

Name of the Samsung Galaxy end of charger [closed]

This is probably a weird question to ask but I am looking for the end "jack" of the Samsung Galaxy S3, S4 etc charger name. Is not the USB side of the cable, is the actual bit which goes inside the ...
0
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0answers
16 views

Would this be a suitable replacement? (Power adaptor) [duplicate]

I've been scouring the internet for a solution to my problem, but to no avail. I hope I'm posting this in the right section too. So I have a TV which won't turn on, and I have determined its because ...
0
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0answers
39 views

PWM lithium-ion charger

I want to make a custom lithium-ion 18650 standard cell charger as I will be charging 100s of them (recycling old laptop batteries). Base on my research, lithium-ion cells use constant-current, ...
0
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2answers
86 views

charging battery directly from a source, what could go wrong?

I have a 100A lead acid deep cycle battery and also have a car's 12V 100A charger (alternator with AVR) At 1500RPM the alternator will produce nearly 100A.. and the battery is directly connected to ...
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0answers
28 views

charge controller not disconnecting at full

When testing batteries and charge controllers I stumbled into something, this is what I found: 12V 100A battery charged using solar system with a charge controller in between, at 13.4V or ...
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0answers
34 views

Does the battery protection circuitry work automatically within this Li-Ion charger IC (STNS01)?

I want to use the STNS01 Li-Ion Charger/LDO regulator in my circuit for its protection circuitry including overcurrent, overdischarge, overcharge, and over temperature circuitry. However, I can't ...
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votes
1answer
51 views

Connecting OverCharging kit with charger [closed]

I Have one battery of 12V and 3.5 A. I purchased charger whose output is 12V and 3A. I also purchased overcharging kit. But dont know how to connect the overcharging kit with charger. You can see pics ...
0
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0answers
71 views

2S LiPo Charger IC With Built-In Boost (allowing 5V voltage supply)

So before I get to my question, I wanted to give a bit of background info on what I am working with. Basically I have a device which is USB powered. It has an ATMega32u4, and two SN754410 H-Bridge ...
1
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1answer
72 views

Prevent Mobile over charging?

This is my second time changing my mobile because I forgot it all the night on the charger. I know there is an IC or circuit inside my phone that will disconnect the charger once the battery is fully ...
2
votes
2answers
78 views

How to make USB smartphone charger? [duplicate]

I want to make a USB cell phone charger. I know USB operates in 5 volts which means i need to drop down voltage if i have battery potential greater than 5 Volts. I have 12 volts sealed lead acid ...
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0answers
25 views

Help with solar panel/battery & load calculations

First solar project and I've been researching for a couple of days but still struggling with some basics. Trying to set up a simple 12v system, maintained by a solar panel. Solar Panel> Charge ...
1
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1answer
66 views

Will a diode conduct if one side is floating and one side has voltage applied to it?

I have a circuit that has a battery output voltage of about 7V and can also have a charger input that when plugged in will output around 9V. The battery/charger power a microcontroller (regulated ...
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votes
1answer
115 views

Can I run a 110v battery charger/maintainer off a solar panel?

I have a Batt Cat II battery charger/maintainer hooked up to the batteries on my boat. I keep it at a storage yard that doesn't have 110v outlets available. I was wondering if it is possible or ...
0
votes
1answer
100 views

pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries.I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel mosfets in an half bridge ...
0
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2answers
26 views

Output charger indications

its a small question ...i got on my cell charger the indications as follow: input:100-240 V 50-60 Hz output: 5 V DC 1 A.... the question is what does the 1 A mean? i am new to circuits and ...
7
votes
2answers
388 views

What is the purpose of these forks?

I have disassembled a phone charger today and I have found some interesting feature that I do not understand, I have marked it on the picture. Left side of this structure is connected to P1, that is ...
0
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1answer
91 views

Making a universal USB charger

I would like to make an universal USB charger. I have a 5V, 2A max generator and I can not find any electronic assembly to create a Dedicated Charging Port able to charge Samsung, Apple and other ...
0
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2answers
65 views

DC-DC & Solar Question

I normally am pretty good with electrics and they taught us about them in a few of my classes, specifically my into to engineering courses. I however don't know a ton about solar panels so this ...
-3
votes
1answer
71 views

can i use a 20V, 2.0A for my laptop that needs 19V, 4.74 A? [closed]

i have a laptop that needs 19V and 4.74A my laptop's charger broke and i replaced it with a 20V and 2.0 A the laptop seems fine but i noticed that the charging goes on and off for like an interval or ...
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votes
1answer
32 views

18v nimh battery charger [duplicate]

For the 18V +/- NIMH battery pack (2 x 9V packs in series @ 200mAh) that I use to run my phono preamp, I need a simple trickle charge circuit. The LM317 IC seems to be the one that is used a lot. ...
0
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2answers
48 views

In a power supply, the current is a constant or gives whats the component/circuit need ? [duplicate]

I everybody, sorry for my english :D . i'm a begginer of electronic and i'm learning a lot of electronic component, voltages, current and so on. My question is about a charger (phone charger for ...
0
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0answers
50 views

Be on the safe side with 12 v battery as powersupply

I have a 12 v battery connected to a LI-PO charger that uses 1.5A. Now i want to make sure i'm not going to fry anything so i want to connect a fuse. Question 1. How do i calculate the value of the ...
0
votes
1answer
84 views

What's the purpose of this bulky cylindrical part near the plug end of a laptop charger cord? [duplicate]

I want to fix my laptop charger cord, I used a multimeter to check the voltage and it gives me less than one volt. It feels very flexible near the plug, but I don't know if I can cut before or after ...
2
votes
1answer
111 views

How to get 5V 4A from two 5V 2A chargers

I have two 5V 2A chargers. I want to get 5v 4A. Can I connect both in parallel like this?: simulate this circuit – Schematic created using CircuitLab Can I do it? Because in parallel ...
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2answers
54 views

Detecting HI-Z state of charge controller

I have been building a Li-Ion charge controller with MCP73831. The STAT pin has 3 states as shown below: The circuit I come up so far is this: Is there a way to detect the HI-Z state with ...
1
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1answer
76 views

Variable Current Lead Acid Battery Charging

I'm designing a solar controller in order to charge SLA batteries. I did some research on dedicated ICs that act as controllers, and found that most implement some sort of MPPT, in order to extract ...
0
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0answers
68 views

Can I decrease volts to increase amps

I made a solar USB charger that uses an LM2596S variable voltage regulator to decrease the ≈22V to 5V. It works fine for my older devices but lacks to current to activate the charge mode on my ...
1
vote
1answer
71 views

Why do laptop batteries and chargers differ in voltage output?

As an example, my laptop's charger gives out 19,5V and 3.42Ah while it's battery gives out 11,1V and 2.2Ah, what's going on exactly?
0
votes
1answer
83 views

charging circuit for series coin batteries

I am designing a circuit that will be powered by two rechargable coin cells in series, and I need to include a module to recharge them in-situ. I have had a look on RS at the range of rechargable ...
1
vote
1answer
135 views

Solar charging using or not using a dummy (dump) load

I'm in the process of designing a small solar regulator / charger (no more than 5A) for sealed lead acid batteries. I have put a working prototype together and all seems to be working. However, ...
0
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0answers
38 views

How to rewire a 6-port usb charging hub

For a project in school I am building a product which displays and charges any device which can run from a usb port. The problem is that I have the holes for the usb ports cut out of custom positions ...
0
votes
1answer
67 views

Operation of a micro USB phone charger outside its limits

Many micro USB phone chargers give 5V DC and 1500 mA output at input 100-240 V AC at 50-60 Hz (these values are from a Sony EP 880 charger). What happens to the output when voltage rises above 240 and ...
0
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2answers
95 views

Triac circuit confusion

X1Iz.png I have the following questions about the above circuit: -Why are we even using a trica/diac combo above. Why would a circuit consisting of just the fuse, switch and primary not be ...
0
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1answer
329 views

Looking for circuit diagrams of current mobile phone chargers [closed]

I am writing an investigation into how a mobile phone charger works and I'm required to break down the internals with a block diagram with component explanations. To help get me on track I'm looking ...
0
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0answers
77 views

Solar panel - voltage regulator

I am contemplating the possibility to run a trolling motor (to push my canoe) with a 250W solar panel. Electrical Specifications: Peak power: 250 W (minus 0, plus 5W Tolerance!) Optimum operating ...
0
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1answer
190 views

Solar Charge Controller Function Details

I am planning to make this controller: I would like to understand the way the components work to switch from charging to dumping and vice versa at set points. Note that the 555 timer is not being ...
1
vote
1answer
43 views

Will the charging current decrease due to a higher input resistance?

I am trying to design a board with USB powered linear battery charger IC charging a 3.7v Li-ion battery. I am concerning about the the relationship between charging path resistance and the maximum ...